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  • Why does a wired network slow down with user increase?

    - by Ed Briscoe
    If you had a wired network, 20 PCs hooked up to a 100 Mbit/sec switch (same onboard ethernet port speed) and you were just sending some test data round. What is the technical explanation as to why 20 machines sending test data around this network to each other is slower than one to one? I mean I know a busy network means it's slower but I'm really trying to understand some more technical details. Thanks for any help

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  • Spanning-tree setup with incompatible switches

    - by wfaulk
    I have a set of eight HP ProCurve 2910al-48G Ethernet switches at my datacenter that are set up in a star topology with no physical loops. I want to partially mesh the switches for redundancy and manage the loops with a spanning-tree protocol. However, our connection to the datacenter is provided by two uplinks, each to a Cisco 3750. The datacenter's switches are handling the redundant connection using PVST spanning-tree, which is a Cisco-proprietary spanning-tree implementation that my HP switches do not support. It appears that my switches are not participating in the datacenter's spanning-tree domain, but are blindly passing the BPDUs between the two switchports on my side, which enables the datacenter's switches to recognize the loop and put one of the uplinks into the Blocking state. This is somewhat supposition, but I can confirm that, while my switches say that both of the uplink ports are forwarding, only one is passing any real quantity of data. (I am assuming that I cannot get the datacenter to move away from PVST. I don't know that I'd want them to make that significant of a change anyway.) The datacenter has also sent me this output from their switches (which I have expurgated of any identifiable info): 3750G-1#sh spanning-tree vlan nnn VLAN0nnn Spanning tree enabled protocol ieee Root ID Priority 10 Address 00d0.0114.xxxx Cost 4 Port 5 (GigabitEthernet1/0/5) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32mmm (priority 32768 sys-id-ext nnn) Address 0018.73d3.yyyy Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec Interface Role Sts Cost Prio.Nbr Type ------------------- ---- --- --------- -------- -------------------------------- Gi1/0/5 Root FWD 4 128.5 P2p Gi1/0/6 Altn BLK 4 128.6 P2p Gi1/0/8 Altn BLK 4 128.8 P2p and: 3750G-2#sh spanning-tree vlan nnn VLAN0nnn Spanning tree enabled protocol ieee Root ID Priority 10 Address 00d0.0114.xxxx Cost 4 Port 6 (GigabitEthernet1/0/6) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32mmm (priority 32768 sys-id-ext nnn) Address 000f.f71e.zzzz Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 sec Interface Role Sts Cost Prio.Nbr Type ------------------- ---- --- --------- -------- -------------------------------- Gi1/0/1 Desg FWD 4 128.1 P2p Gi1/0/5 Altn BLK 4 128.5 P2p Gi1/0/6 Root FWD 4 128.6 P2p Gi1/0/8 Desg FWD 4 128.8 P2p The uplinks to my switches are on Gi1/0/8 on both of their switches. The uplink ports are configured with a single tagged VLAN. I am also using a number of other tagged VLANs in my switch infrastructure. And, to be clear, I am passing the tagged VLAN I'm receiving from the datacenter to other ports on other switches in my infrastructure. My question is: how do I configure my switches so that I can use a spanning tree protocol inside my switch infrastructure without breaking the datacenter's spanning tree that I cannot participate in?

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  • alias name in brocade

    - by wildchild
    how do i look for alias name using the WWN in brocade. Say i have created an alias "CentosNode2Port1" using switch show i get the WWN ,but how to look for the alias name. alishow (WWN) is not accepting. please help

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  • Load balancing application servers with Alteon 2424-SSL

    - by antispam
    We are having problems with load balancing configuration and we would like to clear the situation. We need to load balance among four JavaEE web application servers. The servers are configured as host1 port 7001 host1 port 7002 host2 port 7001 host2 port 7002 Do any of you know if it is possible with Nortel 2424-SSL application switch? Which would be the best configuration for it? (vips, ports, groups, services, ...) Thank you very much.

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  • Does Gigabit degrade all ports to 100 megabit if there is a 100 megabit device attached?

    - by hjoelr
    Our company is buying some HP Procurve managed gigabit switches to replace some of our core switches. However, we aren't able to upgrade all of our switches from 100Mb to Gigabit switches. I think I know the answer but I'm not exactly sure. If we plug those 100Mb switches (or even a 100Mb device) into those Gigabit switches, will the performance of the entire switch drop to 100Mb or will just that one port work at 100Mb?

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  • alias name in bracade

    - by wildchild
    how do i look for alias name using the WWN in brocade. Say i have created an alias "CentosNode2Port1" using switch show i get the WWN ,but how to look for the alias name. alishow (WWN) is not accepting. please help

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  • Break free of a fullscreen app on MacOS X

    - by Petruza
    How do you break free of a fullscreen app on MacOS X? There are some, mostly games, that when they become unresponsive won't allow you to switch to another app with Command-Tab, and I know no other way to close that app or get away from it. Command-W or Command-Q won't work either. Is there a shortcut to launch Activity Monitor, or Terminal, to kill the application?

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  • Reverse KVM solution

    - by aksamit
    I need to setup a computer so that it can be operated from two locations. The locations are about 20 meter from each other and the user wants the experience to be the same from both locations, i.e. no remote desktop or anything like that and preferably a seamless switch. So basically I need a double set of, monitor, keyboard and mouse, and then of course link it together by some kind of suitable hardware.

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  • Cisco sg100-08 connections

    - by Terix
    I have multiple computers, some have a 10/100 ethernet adapter while others have a 10/100/1000 ones. If I connect them together with the Cisco sg100-08 switch, do I keep the 1Gbit speed where possible (between two devices at 1Gbit speed) or the whole lan slows down to 100mbit? I checked Cisco website but I couldn't find this kind of information, nor I was able to register to the Cisco support to ask this question (the registration form does not work)

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  • How does Windows 7 detect my switches?

    - by Daniel
    I notices in the Network overview of Windows 7 that my switches are found on the path to the gateway, which baffled me completely. The last time I checked they just took the ethernet packages and transported them to the "right" location. How does this switch detection work? Do switches alter the packages? Do they react on ICMP messages?

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  • Why should I use a switched network over routed?

    - by SRobertJames
    Now that routers are affordable, why should I build a network using Layer 2 switches, which degenerate to broadcasting under poor conditions, and not just use real routing at Layer 3? Edit: Got some great replies. Let me clarify the question: Of course, at the lowest level, you want to plug your end nodes into a switch, not a router (as demonstrated by AlReece). I'm referring to switches which are used to bridge traffic between segments - that is, switches connected to other switches.

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  • Can ping device from one computer and not the other

    - by Sean Duggan
    I've recently been assigned to work on a diagnostic program done in C++ which communicates with a piece of electronic equipment. Our normal scenario involves communicating via an RS232 interface, but I've been asked to make our program work over ethernet, source code having been done in Visual Basic. After much thrashing about trying to get the code to work and continuing to get 10049 Winsock errors when I tried to connect, I tried pinging the switch. From the computer the VB program is running on, I can see the switch via ping, nslookup, tracert, and pathping (I was going down the list of programs) and I can do this via URI or IP address. From my laptop, sending the same commands fails every time. They're both using the same network cable and the same USB-to-Ethernet device (I've been swapping them between tests) but one can see the switch and the other cannot. I'm working on the programming end, but the ping results makes me think that there might be a network issue stymieing me. wry grin I'm not much of a network guy, so I'm appealing to expert assistance. Both computers are running Windows XP if that helps. The connection is to an "IP-RS8" device which then connects to our VCU-C units. Each unit is accessible via URI or IP address on the desktop computer we usually have connected to the units (it's running the older VB program that I was asked to lift the networking code from). The connection is made via a USB-to-Ethernet adapter so as to leave the regular Ethernet port available for connecting to the company network. Hmm... come to think of it, I've probably been confusing the issue, talking about pinging "the switch" rather than indicating that it's the devices. My apologies. Communication is generally done with a DLL that uses Winsock functions to make queries for data from the VCU and then to receive. I'm failing when connecting. I haven't found anything on the firewall which should block these commands, but I'll keep poking. I don't know if it's potentially relevant, but on the desktop, the adapter maps to Local Area Connection 3 while on the laptop, it consistently maps to Local Area Connection 2. Currently reading up on DHCP. IPConfig /all results: Desktop Host Name . . . . . . . . . . . . : AMERDAEXXXXXX Primary Dns Suffix . . . . . . . : amer.example.com Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : COMPANY.com amer.example.com atle.example.com cone.example.com apac.example.com scan.example.com bYX.example.com Ethernet adapter Local Area Connection X: Connection-specific DNS Suffix . : amer.example.com Description . . . . . . . . . . . : Broadcom NetXtreme XYxx Gigabit Controller Physical Address. . . . . . . . . : YY-XX-YB-XX-XX-XX Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : XYY.XXX.XY.XXX Subnet Mask . . . . . . . . . . . : XXX.XXX.XXY.Y Default Gateway . . . . . . . . . : XYY.XXX.XY.X DHCP Server . . . . . . . . . . . : XY.XXX.XXY.XX DNS Servers . . . . . . . . . . . : XY.XXX.XXY.XX XY.XXY.XXY.XX Primary WINS Server . . . . . . . : XY.XXX.XXY.X Secondary WINS Server . . . . . . : XY.XXY.XXY.X Lease Obtained. . . . . . . . . . : Thursday, July XX, XYXX XY:XX:XX AM Lease Expires . . . . . . . . . . : Sunday, July XX, XYXX XY:XX:XX AM Ethernet adapter Local Area Connection X: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : ASIX axYYYYX USBX.Y to Fast Ethernet Adapter Physical Address. . . . . . . . . : YY-XY-BY-YX-XY-AY Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : XY.Y.Y.X Subnet Mask . . . . . . . . . . . : XXX.XXX.XXY.Y Default Gateway . . . . . . . . . : XY.Y.Y.X DHCP Server . . . . . . . . . . . : XY.Y.Y.XY DNS Servers . . . . . . . . . . . : XY.Y.Y.X Lease Obtained. . . . . . . . . . : Thursday, July XX, XYXX XY:XX:XY AM Lease Expires . . . . . . . . . . : Tuesday, August YX, XYXX XX:XY:XY AM Laptop Windows IP Configuration Host Name . . . . . . . . . . . . : AMERLAFYYXXYX Primary Dns Suffix . . . . . . . : amer.example.com Node Type . . . . . . . . . . . . : Hybrid IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : COMPANY.com amer.example.com atle.example.com cone.example.com apac.example.com scan.example.com bYX.example.com Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : amer.example.com Description . . . . . . . . . . . : Intel(R) 82567LM Gigabit Network Connection Physical Address. . . . . . . . . : YY-XY-BY-DY-XB-YX Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : XYY.XXX.XY.XY Subnet Mask . . . . . . . . . . . : XXX.XXX.XXY.Y Default Gateway . . . . . . . . . : XYY.XXX.XY.X DHCP Server . . . . . . . . . . . : XY.XXX.XXY.XX DNS Servers . . . . . . . . . . . : XY.XXX.XXY.XX XY.XXY.XXY.XX Primary WINS Server . . . . . . . : XY.XXX.XXY.X Secondary WINS Server . . . . . . : XY.XXY.XXY.X Lease Obtained. . . . . . . . . . : Thursday, July XX, XYXX XX:XX:XX AM Lease Expires . . . . . . . . . . : Sunday, July XX, XYXX XX:XX:XX AM Ethernet adapter {XYXAAYXX-YEDY-XXYX-YYEX-BYXYXXYEEYEX}: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Nortel IPSECSHM Adapter - Packet Scheduler iniport Physical Address. . . . . . . . . : XX-XX-XX-XX-XX-YY Dhcp Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : Y.Y.Y.Y Subnet Mask . . . . . . . . . . . : Y.Y.Y.Y Default Gateway . . . . . . . . . : Ethernet adapter Leaf Networks Adapter: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : Leaf Networks Adapter Physical Address. . . . . . . . . : YY-FF-FA-BC-YF-AY Dhcp Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : X.XYY.XY.XX Subnet Mask . . . . . . . . . . . : XXX.Y.Y.Y Default Gateway . . . . . . . . . : Ethernet adapter Local Area Connection 3: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Bluetooth LAN Access Server Driver Physical Address. . . . . . . . . : YY-FX-AX-YA-BY-CA Ethernet adapter Wireless Network Connection 2: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Intel(R) WiFi Link 5300 AGN Physical Address. . . . . . . . . : YY-XX-YA-CX-FC-YE Ethernet adapter Local Area Connection 2: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : ASIX ax88772 USB2.0 to Fast Ethernet Adapter Physical Address. . . . . . . . . : YY-XY-BY-YX-XY-AY Dhcp Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : XYX.XYY.X.X Subnet Mask . . . . . . . . . . . : XXX.XXX.XXX.Y Default Gateway . . . . . . . . . :

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  • Baseline 2952-SFP normal?

    - by Atlas
    I just installed a 3com 2952-sfp, and I had its port #48 connected to another gigabit switch through a cat5e cable. Now when I look at the logs, I see the lines shown below: Mar 23 11:20:15:829 2010 MSTP Critical PFWD Instance 0's GigabitEthernet1/0/48 has been set to forwarding state! Mar 23 11:20:15:822 2010 IFNET Warning LINK UPDOWN GigabitEthernet1/0/48: link status is UP Mar 23 11:20:12:974 2010 IFNET Warning LINK UPDOWN GigabitEthernet1/0/48: link status is DOWN The above happens like dozens of times per day, is there something wrong with my setup?

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  • linksys wrt54g router to a Cisco router?

    - by jasondavis
    This may be a strange question but I have no clue. I currently have a basic linksys wrt54g router fo9r my home network. I am considering getting a rack/cabinet and running a home server or 2 and hooking up my home network to it. If I were to do0 this I could pick up a cisco rack mounted router and switch off ebay to use. So If I were to do this, would I just plugin in the cables for the cisco router from my dsl modem or is there more to it to get these working?

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  • Recommendation for Ethernet switches that allow arbitrary network topologies

    - by sblair
    We have the following requirements for three Ethernet switches that will be connected together: Allow the switches to connect together to form dynamic, arbitrary topologies, i.e., support for the RSTP is essential. Allow the physical topology (which ports are connected together) to be gleaned from the switches, e.g., using SNMP traps. This is optional, but would be very useful. At least 5 ports on each switch, but only 3 will be used for connecting the switches together. Be as compact as possible. Ideally be in stock, in the UK. Only 100Mb/s is required. (This question is the result of the lack of RSTP support from 3Com NJ225 devices, as described in my previous question.)

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  • Switch to tab by typing a substring of its name in Visual Studio 2005

    - by Vineus
    Is there a way to navigate between tabs in VS similar to the emacs iswtichb-mode or Firefox ubiquity switch tab mode (https://wiki.mozilla.org/Labs/Ubiquity/Ubiquity_0.1_Author_Tutorial#Switching_Tabs) ? In these apps, you just type a substring of the title of the tab (or buffer for emacs) to switch to this tab. For instance, to switch to a tab named "App_Code/Data/MyProgram.cs", you just invoke the tab switching command and then type "Progr" for instance to list all the tab whose name matches this string, including "MyProgram.cs". It's much easier to switch between tabs this way when you have a lot of documents open and when you now where to go (which is the case in most situation) Thank you !

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  • Hyper-V server 2012 nic teaming setup and virtual switch configuration

    - by Calvin
    I have a server with 2 nics. I installed Hyper-v 2012 server (not windows server 2012, no gui) I am trying to set up load balancing. I have both nics in the same switch currently in trunk mode and no native vlan. I use the new-netlbfoteam command to create a team with both nics, I can then "set-netlbfoteamnic "Nic Team" -vlanid 4" so that its available to me with a DHCP or static address but as soon as I try to create a virtual switch it becomes unresponsive. My guess is that is due to it removing the vlan tagging I setup. if I add-netlbfoteamnic and set it for vlan 4, then set the IP I can ping it from my management computer but I just get an error "an error occurred while attempting to connect to server "xxxxxx" Check that the Virtual Machine Management service is running and that you are authorized to connect to the server."

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  • configuration transfer over scp on commit not working on Juniper EX-2200 switch

    - by liv2hak
    I am making a series of configuration changes on Junos EX- 2200 switch.I have this router connected to another PC via an ethernet cable.The IP address of the switch is 192.168.1.1.I am able to ping from 192.168.1.1 to 192.168.1.0 and vice-versa. After the changes I make I do the following commands set system archival configuration transfer-on-commit set system archival configuration archive-sites "scp://[email protected]:/home/karthik/ws_karthik/sw1_config_1.txt" password godfather commit Where there is a user with user-name "karthik " and password "godfather".The path shown above also exists in the system How ever I don't see the configuration file sw1_config_1.txt created at the path specified. Also I have verified that sshd is running on the PC (192.168.1.10) Am I doing something wrong here? It would be great if anyone could help me out.

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  • Cisco 2811 router ignored input errors

    - by elbekay
    I've got a Cisco 2811 (AdvIPServices 12.4(25e)) that is showing input errors on both its interfaces, all the errors are of the ignored type. The counter for ignore errors is not increasing continuously, which made me think it would be happening in line with traffic bursts, but there really isn't a large amount of traffic running through it at any time. Both the router interfaces are connected to a 4900 (IPBase 12.2(54)) series switch. The only things I can see are: There is a slight mismatch in duplex/speed negotiation settings, one side is set to auto/auto and one full/auto, however they have negotiated fine. There have been a few fallbacks on the interface buffers, and some trims in the public buffers. Any suggestions for things to look at? I will be correcting the duplex neg settings, and might try a buffer tune, but I don't think it will help.

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  • PowerConnect 2848 , vlan configuration with AP

    - by Francesco
    I need to configure two vlan on an AP connected with a Dell PowerConnect 2848. The first one is up and running (let's say vlan x) , the second one is a completely different network (vlan y) , provided by a Gateway-DHCP wich i have no access, directely Patched (via patch panel) at a secondo AP device. So i cannot just plug this Gateway device on my switch without tagging traffic before, for DHCP collion . I have to solve this problem. I was thinking about tagging the traffic at the port wich I will connect the gateway device with vlan y and then set as trunk (vlanx+y) the AP port. In this way I hope to limit the vlan y traffic ONLY for the ports I selected avoiding the spread of unwanted dhcp calls. But all other ports are Unassigned , so I am not sure they won't forward dhcp (vlan y) traffic. I cannot change the Unassigned state for the vlan x ports cause vlanx is native.

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  • Smart card authentication to a Cisco switch?

    - by murisonc
    We have our Cisco network devices configured to authenticate network administrators using their domain accounts via RADIUS running on a Windows 2008R2 server with the network protection role. This works great for logging into the switch via SSH when configuring the devices. We are now in the beginning stages of deploying smart cards for logins. Does anyone know of a way to login to a Cisco switch using a smart card instead of a domain username and password? The SSH client we are using is Putty. Workstations are Windows 7. RADIUS is running on Windows 2008R2. We are running our own certificate authority on Windows 2008; network is not connected to the Internet. We prefer to not have to purchase additional proprietary devices for this functionality.

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  • How to monitor the temperature of a HP Procurve 3500 switch via SNMP

    - by Murali Suriar
    I am attempting to poll the temperature of an HP ProCurve 3500YL switch remotely using SNMP. Looking at this MIB, it appears that the following OIDs: hpCpuTemperature 1.3.6.1.4.1.11.2.3.7.11.17.7.1.1.1.6 hpPowerSupplyTemperature 1.3.6.1.4.1.11.2.3.7.11.17.7.1.1.1.7 hpChassisTemperature 1.3.6.1.4.1.11.2.3.7.11.17.7.1.1.1.8 Within the 'hpProcurveSysMib' should provide the data I need. However, whenever I attempt to access these OIDs, I receive the response: SNMPv2-SMI::enterprises.11.2.3.7.11.17.7.1.1.1.6 = No Such Object available on this agent at this OID Further investigation reveals that the switch in question does not appear to implement the parent hpProcurveSystem MIB: SNMPv2-SMI::enterprises.11.2.3.7.11.17.7.1.1 = No Such Object available on this agent at this OID Does anyone know of an alternative MIB implemented by the 3500 that will allow its temperature to be polled automatically?

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